Which of the classic theories of color vision states that color vision emerges from the combined activity of three different types of receptors, each being sensitive to a different range of wavelengths

sorry to break it to ya but no one can answer your question it's just

jk but i am serious about the part that most people cant answer it beacuse you did not mention the section you are talking about. but it would if you added some detail and were a bit more specific.